diff --git a/plugin/bananavim.vim b/plugin/bananavim.vim
new file mode 100644
index 0000000..84cc612
--- /dev/null
+++ b/plugin/bananavim.vim
@@ -0,0 +1,130 @@
+if exists("g:loaded_Banananew") || &cp
+	finish
+endif
+let g:loaded_Banananew= 1 " your version number
+let s:keepcpo           = &cpo
+set cpo&vim
+
+if !hasmapto('<Plug>BananaEncnew')
+	map <unique> <Leader>c <Plug>BananaEncNew
+endif
+
+if !hasmapto('<Plug>BananaDecnew')
+	map <unique> <Leader>t <Plug>BananaDecNew
+endif
+
+noremap <silent> <unique> <script> <Plug>BananaEncNew
+			\ :call <SID>Enc()<CR>
+noremap <silent> <unique> <script> <Plug>BananaDecNew
+			\ :call <SID>Dec()<CR>
+
+
+fun! s:Enc() range
+	if line("'<") > 0
+		call s:ReplSel(s:Dec2Ban(s:GetSel()))
+	else
+		call s:EncLine()
+	endif
+endfun!
+
+fun! s:EncLine()
+	call setline('.', substitute(getline('.'), '\d\d*', '\=toupper(s:Doban(submatch(0)))','g'))
+endfun!
+
+fun! s:Dec() range
+	if line("'<") > 0
+		call s:ReplSel(s:Ban2Dec(s:GetSel()))
+	else
+		call s:DecLine()
+	endif
+endfun!
+
+fun! s:DecLine()
+	call setline('.', substitute(getline('.'), '\C\u\u*', '\=s:Unban(tolower(submatch(0)))','g'))
+endfun!
+
+let s:dictionary = [['b', 'c', 'd', 'f', 'g', 'l', 'm', 'n', 'p', 'r', 's', 't', 'v', 'z'], ['a', 'e', 'i', 'o', 'u']]
+let s:numdict = len(s:dictionary)
+
+fun! s:Doban(num)
+	let l:v = a:num
+	let l:st = ''
+	let l:l = 0
+
+	let l:i = (s:numdict - 1) % s:numdict
+
+	while ! (l:v == 0 && l:i == (s:numdict -1) % s:numdict && l:l >= 0)
+		let l:r = l:v % len(s:dictionary[l:i])
+		let l:v = l:v / len(s:dictionary[l:i])
+		let l:st = s:dictionary[l:i][l:r] . l:st
+		let l:i = abs((l:i - 1) % s:numdict)
+		let l:l = l:l + 1
+	endwhile
+	return l:st
+endfun!
+
+fun! s:Unban(ban)
+	if ! s:IsBanana(a:ban)
+		return toupper(a:ban)
+	endif
+
+	let l:v = 0
+	for l:i in range(len(a:ban))
+
+		let l:r = (s:numdict + l:i) % s:numdict
+		let l:p = index(s:dictionary[l:r],a:ban[l:i])
+
+		let l:v = l:v * len(s:dictionary[l:r]) + l:p
+	endfor
+
+	return l:v
+endfun!
+
+fun! s:IsBanana(ban)
+	if (len(a:ban) % s:numdict) != 0
+		return 0
+	endif
+
+	for l:i in range(len(a:ban))
+		let l:r = (s:numdict + l:i) % s:numdict
+		if index(s:dictionary[l:r],a:ban[l:i]) == -1
+			return 0
+		endif
+	endfor
+
+	return 1
+endfun!
+
+fun! s:GetSel()
+	let [l:lstart, l:cstart] = getcharpos("'<")[1:2]
+	let [l:lend, l:cend] = getcharpos("'>")[1:2]
+	let l:lines = getline(l:lstart, l:lend)
+	if len(l:lines) == 0
+		return ''
+	endif
+	let l:lines[-1] = l:lines[-1][: l:cend - (&selection == 'inclusive' ? 1 : 2)]
+	let l:lines[0] = l:lines[0][l:cstart - 1:]
+	return join(l:lines, "\n")
+endfun!
+
+fun! s:ReplSel(str)
+	let [l:lstart, l:cstart] = getcharpos("'<")[1:2]
+	let [l:lend, l:cend] = getcharpos("'>")[1:2]
+	let l:lines = getline(l:lstart, l:lend)
+	let l:new_str = slice(l:lines[0],0,l:cstart - 1) . a:str . l:lines[-1][l:cend:]
+	let l:new_str_lst = split(l:new_str,'\n')
+	call setline(l:lstart ,l:new_str_lst)
+	delmarks < >
+endfun!
+
+fun! s:Dec2Ban(text)
+	return substitute(a:text, '\d\d*', '\=toupper(s:Doban(submatch(0)))', 'g')
+endfun!
+
+fun! s:Ban2Dec(text)
+	return substitute(a:text, '\C\u\u*', '\=s:Unban(tolower(submatch(0)))', 'g')
+endfun!
+
+let &cpo= s:keepcpo
+unlet s:keepcpo
+